EP2828078A1 - Utilisation d'une structure multicouche a base de polymere halogene comme feuille de protection de module photovoltaique - Google Patents
Utilisation d'une structure multicouche a base de polymere halogene comme feuille de protection de module photovoltaiqueInfo
- Publication number
- EP2828078A1 EP2828078A1 EP13719906.3A EP13719906A EP2828078A1 EP 2828078 A1 EP2828078 A1 EP 2828078A1 EP 13719906 A EP13719906 A EP 13719906A EP 2828078 A1 EP2828078 A1 EP 2828078A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- substrate
- multilayer structure
- use according
- stack
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10788—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing ethylene vinylacetate
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
- H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
- H10F19/85—Protective back sheets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- the present invention relates to the use of a multilayer structure in the front and / or rear protection foil of a photovoltaic module, said multilayer structure comprising a substrate based on halogenated polymer covered with at least one stack of two layers of SiO 2 and SiO x N y H z , respectively. It also relates to a photovoltaic module comprising the above-mentioned multilayer structure in its front and / or back protection sheet.
- a photovoltaic module or solar panel, is an electrical generator that transforms part of the solar energy it receives into direct current; it consists of a set of photovoltaic cells based on a semiconductor material such as silicon, interconnected electrically and protected by an adhesive encapsulating material, generally based on ethylene / vinyl acetate copolymer (EVA).
- EVA ethylene / vinyl acetate copolymer
- An upper protective sheet or "frontsheet” in English
- a protective sheet on the back of the module or “backsheet” in English
- These protective sheets front and rear commonly known in French as the front face (FAV) and rear face (FAR) modules, may, in turn consist of one or more layers of similar or different materials.
- the front and rear faces will have particular properties.
- the most widespread panels currently contain cells based on single or multi-crystalline silicon, encapsulated by EVA and protected on the front face by a glass plate and, on the rear face, by a multi-layer structure containing poly (ethylene terephthalate) (PET) between two layers based on a fluorinated polymer such as polyvinyl fluoride (PVF) or polyvinylidene fluoride (PVDF).
- PET poly (ethylene terephthalate)
- PVDF polyvinyl fluoride
- PVDF polyvinylidene fluoride
- the front glass provides good shock protection, good transparency and excellent moisture protection, despite the disadvantages of a weight therefore because the glass, in typical thickness of 3 mm, is the main contributor to the weight of the module.
- the glass also offers good resistance to aging.
- the function of the rear face is also to protect the cell against humidity, even if the level of protection is much lower than that offered by the glass, but also to ensure the electrical insulation of the cells, block UV rays and have good mechanical resistance, especially tearing, while allowing the module to resist aging during its lifetime which must exceed, in many cases, 20 years. It is understood that the nature and design of these front and rear protective sheets therefore play a key role in the longevity of the photovoltaic module.
- a flexible photovoltaic module front protection layer comprising a transparent halogenated polymer substrate such as PVDF. (polyvinylidene fluoride) optionally coated, on the outside, with a SiOx layer for reinforcing its barrier properties. It is known that the SiOx layer can be deposited by methods such as chemical vapor deposition, reactive sputtering or thermal evaporation.
- this type of inorganic deposition generates mechanical stresses related in particular to the differences in mechanical and thermal behavior between the inorganic layer and the polymer, in particular their differences in elastic modulus, deformation capacity and coefficients of thermal expansion. These constraints cause damage to the deposited inorganic layer, which has the effect of limiting its functional properties. Cracks may then appear which reduce the gas barrier properties of the polymer substrate and the inorganic deposition.
- these SiOx deposition techniques are relatively expensive. To overcome this disadvantage, it is certainly possible to deposit the SiOx layer by sol-gel route. However, the layer thus obtained is porous and therefore can not fulfill its function as a gas barrier layer.
- This structure is prepared by deposition of perhydropolysilazane (PHPS) on a PET substrate, then conversion of the PHPS by VUV and UV irradiation to form at least one stack having a total thickness of 250 nm and comprising a PHPS layer partially converted to nitride. hydrogenated silicon, a layer partially converted interfacial of silicon oxynitride and a thin layer of rigid silica. Different stacks are made, possibly separated from each other by a layer of PVA. If this structure has undeniable advantages vis-à-vis the prior art, its gas tightness needs to be further improved.
- PHPS perhydropolysilazane
- JP2011-143327 and JP2011-173057 have also been suggested in JP2011-143327 and JP2011-173057 to apply one or more barrier layers on a substrate which may be PVC, by deposition of perhydropolysilazane on the substrate, followed by two VUV irradiations under atmospheres. different, or a substrate treatment (including UV) and VUV irradiation.
- a substrate treatment including UV
- VUV irradiation is always carried out in the presence of a high oxygen and / or water level which does not make it possible to obtain a satisfactory barrier layer.
- a photovoltaic module made of glass
- a transparent, abrasion-resistant film consisting for example of a fluoropolymer hydrophobic which is either loaded with inorganic particles, or inorganic graft.
- a hard moisture barrier layer may be interposed between the glass substrate and the film. This may especially be formed of silicon oxide obtained from perhydropolysilazane. It would be desirable to have a front or back layer of photovoltaic module that is more flexible and lighter than that proposed in this document.
- the present invention relates to the use of a multilayer structure in the front and / or rear protection film of a photovoltaic module comprising photovoltaic cells covered with an encapsulant.
- the front and / or rear protective sheet in which the multilayer structure is included does not contain any glass layer with a thickness of 50 ⁇ m or more.
- This multilayer structure comprises: (a) a substrate containing at least one halogenated polymer, and (b) at least one stack of a layer (A) of SiO 2 and a layer (B) of SiO x N y H z disposed between the substrate and the layer (A). Said stack is disposed on the face of the substrate facing the encapsulant and possibly on the opposite face of the substrate.
- the layer (A) and the layer (B) have thicknesses (e A , e B ) such that the thickness (e A ) of the layer (A) is less than or equal to 60 nm, the thickness (e B ) of the layer (B) is greater than twice the thickness (e A ) of the layer (A) and the sum of the thicknesses of the layer (A) and the layer (B) is between 100 nm and 500 nm, and in which z is strictly less than the ratio (x + y) / 5, advantageously z is strictly less than the ratio (x + y) / 10.
- the present invention also relates to a photovoltaic module enclosing photovoltaic cells protected by an encapsulant, a front protective sheet and a rear protective sheet, wherein the front and / or rear protective sheet comprises a multilayer structure as defined above and does not contain a glass layer with a thickness of 50 ⁇ m or more.
- the multilayer structure used according to the invention is a film having good chemical resistance and aging, which can be transparent and which protects photovoltaic components vis-à-vis oxygen for the greatest number of years, and at an acceptable production cost.
- the use of a liquid phase deposition technique of the bilayer stack according to the invention makes it possible to obtain in a simple manner and at a low cost a level of gas-tightness which can not be obtained by conventional deposition technologies, such as physical vapor deposition and deposition. chemical vapor phase.
- the multilayer structure used according to the invention comprises, and preferably consists of, a substrate containing at least one halogenated polymer and at least one stack consisting of a layer of SiO 2 and a layer of material of SiO x N y H z type interposed between the substrate and the SiC layer> 2.
- the SiO x N y H z type layer forms a mechanical accommodation layer between the substrate and the SiO 2 layer and makes it possible to adapt the stresses between the substrate and the SiC 2 layer, which limits the deterioration of the layer.
- SiC> 2 improves the gas tightness of the SiC layer> 2.
- the interposition of a layer forming a mechanical interface that is thicker and less rigid than the SiC 2 layer prevents the SiO 2 layer from breaking.
- the substrate comprises at least one halogenated polymer, preferably transparent. It is usually a thermoplastic polymer.
- halogenated polymer is intended to mean a homopolymer or copolymer of which at least one of the monomers comprises a CX bond, where X is a fluorine, chlorine or bromine atom.
- the halogenated polymer may in particular be a fluorinated and / or chlorinated homo- or copolymer, preferably a fluorinated homo- or copolymer.
- the fluorinated homo- and copolymers may, for example, be chosen from those comprising at least 50 mol%, and advantageously consisting of monomers of formula (I):
- PVDF polyvinylidene fluoride
- HFP hexafluoropropylene
- CFE chlorotrifluoroethylene
- HFP hexafluoropropylene
- VF3 trifluoroethylene
- TFE tetrafluoroethylene
- VF3 trifluoroethylene
- FEP fluoroethylene / propylene copolymers
- copolymers of ethylene with fluoroethylene / propylene FEP
- fluoroethylene / propylene FEP
- TFE tetrafluoroethylene
- PMVE perfluoromethylvinyl ether
- CFE chlorotrifluoroethylene
- HFP hexafluoropropylene
- chlorinated polymer is polyvinyl chloride or PVC.
- PVC polyvinyl chloride
- Other chlorinated polymers useful in this invention are polyvinyl chloride (CPVC) such as ARKEMA Lucalor and vinyl chloride copolymers with monomers such as acrylonitrile, ethylene, propylene or vinyl acetate, as well as polyvinylidene chloride and its copolymers with vinyl monomers, in particular acrylic monomers.
- CPVC polyvinyl chloride
- ARKEMA Lucalor polyvinyl chloride copolymers with monomers such as acrylonitrile, ethylene, propylene or vinyl acetate, as well as polyvinylidene chloride and its copolymers with vinyl monomers, in particular acrylic monomers.
- the chlorinated polymer used according to the invention is a mixture including at least two of the chlorinated polymers or copolymers above.
- vinyl chloride copolymers it is preferable that the proportion of vinyl chloride units
- halogenated polymers used according to the invention can be obtained by suspension polymerization processes, microsuspension, emulsion or bulk, well known to those skilled in the art.
- the halogenated polymer substrate may for example have a thickness ranging from 5 to 500 ⁇ m, in particular from 20 to 100 ⁇ m and preferably from 25 to 60 ⁇ m.
- the halogenated polymeric substrate may be surface-treated, for example, by Corona type treatment, so as to improve its adhesion to the inorganic deposition layers. It is generally preferred to subject the substrate to any treatment for increasing its surface tension to values of the order of 50 - 60 mN / m. (or dyn / cm)].
- the resistance of the substrate to radiation, especially UV radiation can be enhanced by the addition of organic or inorganic UV stabilizers.
- this polymer substrate is covered, on at least one of its faces, with at least one bilayer stack.
- This bilayer stack may be present on the face of the substrate facing the encapsulant and possibly on its opposite face.
- Each layer of this stack has a particular composition and thickness. More specifically, this stack consists of a SiC layer> 2 and a layer of SiO x N y H z material interposed between the substrate and the SiC layer> 2.
- the composition of the SiO x N y H z layer is such that y and z are strictly greater than 0 and z is strictly less than the ratio (x + y) / 5, advantageously z is strictly less than the ratio (x + y) / 10.
- the value of x decreases from the interface between the SiO x N y H z layer and the S102 layer to the substrate, and that the value of y increases from the interface between the SiO x layer. N y H z and the S102 layer to the substrate.
- x varies from 2 to 0 and / or varies from a value strictly greater than 0 but less than 1 up to a value of 1.
- these layers have thicknesses such that the thickness of the layer of SiC> 2 is less than or equal to 60 nm, the thickness of the layer of SiO x N y H z is greater than twice the thickness of the SiC layer> 2 and the sum of the thicknesses of these layers is included between 100 nm and 500 nm.
- the layer of SiC> 2 may for example have a thickness of 40 to 60 nm and the SiO x N y H z layer may have a thickness ranging for example from 100 to 200 nm, in particular from 150 to 200 nm.
- the Young M A modulus of the SiO 2 and M B layer of the SiO x N y H z layer are such that:
- the SiO x N y H z layer is not only thicker than the SiC 2 layer, but also less rigid than the SiC x 2 layer, due to its greater Young's modulus. low, so that it can better fit the constraints, and to limit the differential strain between the layer 2 and the substrate S1O.
- the refractive index of the multilayer structure is preferably greater than 1.5.
- the materials of its constituent layers can be amorphous.
- the aforementioned bilayer stack may be formed according to a method which will now be described. This process comprises a step of converting a perhydropolysilazane (PHPS), that is to say a compound of formula (I):
- PHPS perhydropolysilazane
- n is an integer such that the number average molecular weight of the PHPS is between 150 and 150,000 g / mol.
- the PHPS is used in the form of a solution in an aprotic, polar or apolar solvent, such as ethers (including dibutyl ether), esters, ketones, aliphatic or aromatic hydrocarbons (including xylene) or mixtures of these solvents.
- concentration of the PHPS in the solution depends on the thickness of the liquid film to be deposited. For a film thickness of the order of 5 ⁇ m, it can thus range from 2 to 15% by weight of PHPS.
- the application of the PHPS solution to the substrate can be carried out by any known means, in particular by heliography, flexography, slit die coating, centrifugation, roller coating, sputtering or coating with Meyer bars. It is furthermore preferred that the PHPS deposition be carried out at room temperature.
- the solution of PHPS can be modified, so that the wettability of the solution during deposition is adapted to the low free surface energy of certain halogenated substrates such as PVDF, especially when it is not surface-treated.
- certain halogenated substrates such as PVDF
- the PHPS in the form of a solution in an aprotic polar solvent such as dibutyl ether, it may be useful to dilute it with an apolar solvent such as an alkane.
- the volume ratio of the apolar solvent to the aprotic polar solvent may be adjusted by those skilled in the art depending on the chemical nature of the substrate and may especially be from 1:10 to 1: 2.
- it is possible to increase the surface energy of the halogenated substrate by subjecting it to plasma or corona treatment.
- the solvent is evaporated either by free drying in air, under a stream of inert gas such as nitrogen or under vacuum, at room temperature, or by infrared lamp or air or depleted air or hot nitrogen .
- the deposited layer of PHPS advantageously has a thickness, after evaporation of the solvent, of between 100 and 400 nm, preferably between 150 and 350 nm, better still, between 200 and 300 nm.
- the conversion of the PHPS applied to the substrate can then be carried out by means of irradiation using UV radiation at a wavelength greater than or equal to 200 nm, especially between 240 and 280 nm, and simultaneously or successively, an irradiation using ultraviolet radiation of the vacuum or VUV (for "Vacuum Ultraviolet") at a wavelength less than or equal to 200 nm, in particular between 180 and 200 nm, under a atmosphere with a rate oxygen less than 500 ppm and a water level less than or equal to 1000 ppm.
- VUV for "Vacuum Ultraviolet
- the irradiation is generally carried out at room temperature and it can for example be done by means of a low pressure mercury lamp which combines a VUV wavelength of 185 nm and a UV wavelength of 254 nm.
- the dose received for the radiation at 185 nm is for example less than 20 joules / cm 2 .
- the formation of the SiO 2 layer and the formation of the SiO x N y H z layer are simultaneous.
- the process for forming these layers is carried out under specific oxygen and water-depleted conditions which make it possible to limit the thickness of the SiO 2 layer as well as the conversion of the SiO x N y H z layer, and thus of obtain the composition and thickness characteristics of the above-mentioned layers.
- the duration of the irradiation is a function of the thickness of the deposit and generally ranges from 1 to 10 minutes. For a thickness of 200 to 300 nm, an irradiation time of about 5 minutes is generally sufficient.
- the process can be carried out in two steps: in a first step, a layer of PHPS is deposited on the substrate. This layer is then subjected to UV irradiation of wavelength greater than 220 nm in the presence of a negligible oxygen and water level, ie less than 10 ppm. In a second step, another layer of PHPS is deposited on the first layer, then this second layer is irradiated by VUV at a wavelength of less than 200 nm in the presence of oxygen, the oxygen concentration then being between 10 ppm and 500 ppm.
- the small amount of Si-H can be detected in reflection on the substrates described in the invention.
- the transmittance in the wave number range 2100-2300 CIIT 1 is then greater than 80%, preferably greater than 90%.
- the chemical composition of the layers after irradiation can be further verified by mass spectrometry at flight time in secondary ionization (TOF-SIMS), for example using an IontoF V spectrometer equipped with a 25 keV and 1.5 pA Bi + ion source and an ion source Cs + 2 keV and 128 nA.
- TOF-SIMS secondary ionization
- the structure used according to the invention may comprise a layer of a polymer material deposited on the bilayer stack, for example by evaporation and / or polymerization.
- the polymer used in this layer may be halogenated or not. It may especially be chosen from hybrid materials such as organosilanes, polymeric block materials with lamellar structure, co-continuous or matrix / inclusion type, such as acrylic block copolymers such as poly (methyl methacrylate).
- the layer of polymeric material preferably has a thickness less than or equal to that of the substrate, even though layers of polymeric material of greater thickness than the substrate may be preferred in particular structures.
- the layers of this polymeric material may have, independently from each other, a thickness of 1 to 30 pm, for example.
- barrier properties to elements other than gases, for example UV rays, or moisture absorption properties, for example. Thanks to the SiO x N y H z layer, the mechanical problems during the deposition of the aforementioned polymer material layer are limited, such as the curvature of the entire structure.
- the multilayer structure may comprise n stacks, n being a positive integer greater than 1, each stack comprising a layer (A) of Si0 2 and a layer (B) of SiO X iN yi H zi type material , i being a positive integer between 1 and n and zi being strictly less than the ratio (xi + yi) / 5, advantageously z ⁇ is strictly less than the ratio (Xi + yi) / 10, xi, yi, z ⁇ being identical or not for the different values of i.
- a structure can be prepared by repeating the steps of the method described above. The effect on gas barrier properties is further increased.
- a particularly preferred multilayer structure is one comprising one or more of the stacks described above, arranged symmetrically on one side and the other (front and back) of the substrate.
- a single bilayer stack or n stack of bilayers can thus advantageously be arranged on the front and back side of the polymer substrate.
- the multilayer structures comprising n stacks of inorganic bilayers may comprise at least one layer of polymer material disposed between the layer of SiO 2 of a stack and the layer of SiO X iN yi H zi of the stack following directly, for example n-1 layers of polymer material, each of the layers of polymer material being arranged between two stacks.
- the functional properties of the structure are thus reduced because of the series of n dense layers Ai S1O 2 and n-1 interposition layers of polymer material.
- All the multilayer structures described above are particularly useful as the front face of photovoltaic modules. In this case it is preferred that they be transparent, that is to say that they have a total transmittance, measured according to ASTM D1003, of greater than 85%. In addition, these structures can be inserted into opaque or transparent multi-layer laminates that can serve as a rear face of photovoltaic modules.
- the multilayer structure is previously shaped according to conventional techniques for producing films, sheets or plates.
- extrusion blow molding extrusion lamination, extrusion coating, extrusion of flat film or extrusion of sheets. All these techniques are known to those skilled in the art and it will adapt the conditions of implementation of different techniques (extruder temperature, connection, dies, speed of rotation of the screws, cooling temperatures of the cooling cylinders, etc. .. ) to form the structure according to the invention having the desired shape and thicknesses. It would not go beyond the invention if this structure was shaped by pressing techniques, lamination with adhesives en route solvent or aqueous, or if it undergoes an additional annealing step.
- the invention therefore also relates to a photovoltaic module enclosing photovoltaic cells protected by an encapsulant, a front protective sheet and a rear protective sheet, wherein the front and / or rear protective sheet comprises a multilayer structure as described above and does not contains no glass layer with a thickness of 50 ⁇ m or more.
- the multilayer structure may constitute the front protective sheet of the photovoltaic module.
- the rear protective sheet may consist of a three-layer structure, containing a central layer based on polyester such as polyethylene terephthalate (PET), surrounded by two fluoropolymer-based layers, such as the polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF) or poly (ethylene / tetrafluoroethylene) (ETFE).
- the rear protective sheet may consist of polyolefins, in particular polypropylene, optionally grafted polyamide or functionalized with maleic anhydride, alone or in combination with one or more optionally functionalized fluoropolymer layers, such as PVDF.
- the rear protection sheet may consist of one or more polyamide layers optionally reinforced with glass fibers, used alone or in a multilayer structure comprising a central layer of PET.
- the backing sheet may comprise aluminum foil and / or glass.
- the multilayer structure described above is integrated in the rear protective sheet of a photovoltaic module.
- it may be associated with at least one of the materials constituting the rear protection sheets described above, thus considerably improving the barrier properties of the rear protective sheet when it does not include a metal layer. (like aluminum) or glass.
- It can also contain various additives including shock modifiers, inorganic or organic pigments, dyes, optical brighteners, coupling agents, crosslinking agents, plasticizers, thermal stabilizers, stabilizers vis-à-vis hydrolysis, antioxidants (for example of the phenol and / or phosphite and / or amine type), reinforcements such as fiberglass, flame retardants, and mixtures thereof.
- the front protection sheet may then consist of glass, poly (methyl methacrylate) or PMMA, a homo- or fluorinated copolymer such as PVDF, a mixture of fluorinated polymer and PMMA or multilayer structures obtained from these materials.
- the encapsulant is generally based on at least one polymer such as an ethylene / vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), ionomers, poly (methyl methacrylate) (PMMA) ), a polyurethane, a polyester, a silicone elastomer and mixtures thereof.
- the photovoltaic cells may comprise doped, mono-crystalline or polycrystalline silicon, amorphous silicon, cadmium telluride, copper-indium disilinide, or organic materials, for example.
- the manufacture of the photovoltaic module can be done according to the methods known to those skilled in the art and in particular as described in US-5, 593, 532.
- the assembly of the various layers can be done by hot pressing or vacuum , or hot rolling.
- EXAMPLE 1 Manufacture of a Multilayer Structure According to the Invention
- a precursor solution was prepared by mixing a commercial solution of PHPS (NN 120-20 (A) supplied by CLARIANT) at 20% in dibutyl ether with dibutyl ether. hexane as co-solvent, in a volume ratio of hexane to dibutyl ether of 1: 5.
- the substrate has been decontaminated with the aid of a cleaning machine.
- TEKNEK leaves before the deposition of the precursor liquid layer.
- PHPS solution was then applied on a substrate, consisting of PVDF (Kynar ® 740 from Arkema) in a thickness of 30 or 50 microns, as the case, and A4, using a Meyer bar, so as to obtain a layer of moist PHPS 4 to 6 pm thick.
- the solvent was then evaporated by free drying for a few minutes at room temperature.
- the PHPS layer obtained had a thickness of 250 nm.
- the coated substrate was then placed in an enclosure under a stream of continuous dry nitrogen, so as to obtain a hygrometry of less than 1000 ppm and an oxygen content of between 10 and 500 ppm.
- the conversion of the PHPS by irradiation was then carried out using a low-pressure mercury lamp, with VUV (185 nm) and UV (254 nm) radiation, for a duration of 5 minutes corresponding to a dose of order of 10 J / cm 2 .
- V a structure S3 obtained in a manner similar to Example 1, except that the layer of PHPS was deposited on each side (front and back) of the PVDF substrate
- VI a comparative structure S3 'corresponding to structure S3, except that the substrate consisted of PET.
- the test protocol consists in placing the sample (substrate alone or coated) at the interface of an enclosure comprising a controlled atmosphere and a continuous high vacuum measurement chamber (mass spectrometry flow measurement). The temperatures of the substrate and the atmosphere are kept constant (38 ° C) while the hygrometry (in the case of water vapor) is saturated (liquid / vapor equilibrium).
- the numerical value of the WVTR is obtained by the prior passage of a reference polymer of known WVTR (in this case, PET).
- Table 2 below also gathers the barrier properties of the structures tested, obtained in a helium permeation test.
- the measurement of the helium barrier properties is carried out with the same apparatus as previously described; in this case, the saturated water atmosphere is replaced by a dry helium atmosphere of known pressure. It has been observed that the measurement of helium permeability is a reliable tool for evaluating the water barrier properties.
- the barrier properties are expressed in terms of improvement factor, also referred to as BIF (for "Barrier Improvement Factor”), relative to the PVDF substrate alone.
- BIF Barrier Improvement Factor
- Structure S3 '8 As can be seen from Table 2, the addition of one (and more particularly two) two-layer stacks makes it possible to significantly improve the barrier properties of the substrate based on halogenated polymer.
- the symmetrical structure comprising a bilayer stack on each side of the substrate (front and back) is particularly powerful.
- the multilayer structures according to the invention have helium barrier properties significantly higher than similar structures based on PET.
- Example 3 Manufacture of Photovoltaic Modules and Evaluation of Their Resistance to Aging
- a photovoltaic mini-module was manufactured using the film of Example 1, according to the following manufacturing procedure.
- the chain of cells 1 x 2 was placed between two sheets cut to A4 size encapsulant crosslinkable EVA (VistaSolar ® Fast Cure 486.00 supplied by Solutia) having a thickness close to 400 pm before lamination.
- the resulting assembly was completed by a 3.2 mm thick glass back (FAR), cut to A4 dimensions, as well as by the structure film SI obtained in Example 1, which made front panel (FAV) function of the module.
- FAV front panel
- This assembly FAV Sl / crosslinkable EVA film / 1x2 cell chain / crosslinkable EVA film / glass was introduced, with the FAR at the bottom, into a pilot laminator S1815E of the company 3S, to proceed with the manufacture of the module, according to the cycle following lamination.
- the assembly was introduced into the laminator which was at a set temperature of 145 ° C.
- the laminator had two chambers separated by a flexible membrane.
- the module was in the lower chamber in indirect contact with the hotplate of the laminator, because the pads coming out of the heating stage supported the module, initially at a distance of about 1 cm from the plate.
- the vacuum up to less than 10 mbar
- This phase called degassing, lasted 5 minutes, during which the module began to rise in temperature.
- the actual lamination phase started and two events occurred: 1) the pads lowered and the module came into direct contact with the hot platen, and 2) the pressure in the upper chamber was brought to atmospheric pressure, while keeping the lower chamber under vacuum, so that the flexible membrane separating the two chambers came to press against the module because of the pressure difference (ie 1 bar) between the two bedrooms.
- This second phase lasted 10 minutes, after which the two chambers were put back to atmospheric pressure and the module was extracted from the laminator.
- a photovoltaic module that is ready to be characterized has been obtained.
- This photovoltaic module was placed in an aging chamber with moist heat (85 ° C, 85% humidity) for 1,000 hours and inspected after this time, looking for signs of aging or degradation.
- the photovoltaic module showed a very good behavior, without appearance of color (aunatorium), and the adhesion between the layers was preserved.
Landscapes
- Laminated Bodies (AREA)
- Photovoltaic Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1252615A FR2988520B1 (fr) | 2012-03-23 | 2012-03-23 | Utilisation d'une structure multicouche a base de polymere halogene comme feuille de protection de module photovoltaique |
PCT/FR2013/050618 WO2013140101A1 (fr) | 2012-03-23 | 2013-03-22 | Utilisation d'une structure multicouche a base de polymere halogene comme feuille de protection de module photovoltaique |
Publications (2)
Publication Number | Publication Date |
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EP2828078A1 true EP2828078A1 (fr) | 2015-01-28 |
EP2828078B1 EP2828078B1 (fr) | 2016-06-29 |
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EP13719906.3A Not-in-force EP2828078B1 (fr) | 2012-03-23 | 2013-03-22 | Utilisation d'une structure multicouche a base de polymere halogene comme feuille de protection de module photovoltaique |
Country Status (8)
Country | Link |
---|---|
US (1) | US20150047694A1 (fr) |
EP (1) | EP2828078B1 (fr) |
JP (1) | JP2015512561A (fr) |
KR (1) | KR20140144190A (fr) |
CN (1) | CN104203564B (fr) |
ES (1) | ES2593045T3 (fr) |
FR (1) | FR2988520B1 (fr) |
WO (1) | WO2013140101A1 (fr) |
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KR101833800B1 (ko) | 2014-12-19 | 2018-03-02 | 삼성에스디아이 주식회사 | 실리카계 막 형성용 조성물, 실리카계 막의 제조방법 및 상기 실리카계 막을 포함하는 전자 소자 |
KR101837971B1 (ko) | 2014-12-19 | 2018-03-13 | 삼성에스디아이 주식회사 | 실리카계 막 형성용 조성물, 실리카계 막, 및 전자 디바이스 |
KR20170014946A (ko) | 2015-07-31 | 2017-02-08 | 삼성에스디아이 주식회사 | 실리카 막 형성용 조성물, 실리카 막의 제조방법 및 실리카 막 |
FR3111566B1 (fr) * | 2020-06-19 | 2022-10-07 | Arkema France | Masques de protection respiratoire en pvdf et procede de recyclage |
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2013
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- 2013-03-22 JP JP2015500970A patent/JP2015512561A/ja active Pending
- 2013-03-22 EP EP13719906.3A patent/EP2828078B1/fr not_active Not-in-force
- 2013-03-22 CN CN201380015995.2A patent/CN104203564B/zh not_active Expired - Fee Related
- 2013-03-22 KR KR1020147026497A patent/KR20140144190A/ko not_active Ceased
- 2013-03-22 US US14/386,056 patent/US20150047694A1/en not_active Abandoned
- 2013-03-22 WO PCT/FR2013/050618 patent/WO2013140101A1/fr active Application Filing
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Title |
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See references of WO2013140101A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2013140101A1 (fr) | 2013-09-26 |
EP2828078B1 (fr) | 2016-06-29 |
US20150047694A1 (en) | 2015-02-19 |
FR2988520A1 (fr) | 2013-09-27 |
KR20140144190A (ko) | 2014-12-18 |
FR2988520B1 (fr) | 2014-03-14 |
CN104203564A (zh) | 2014-12-10 |
JP2015512561A (ja) | 2015-04-27 |
CN104203564B (zh) | 2016-08-24 |
ES2593045T3 (es) | 2016-12-05 |
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